#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main() {
    int n, h, m;
    scanf("%d %d %d", &n, &h, &m);
    int i = 0;
    while (m > 0) {
        m = m - h;
        i++;
    }
    printf("%d", n - i);
    return 0;
}